As you cross the bridge Luís I to Vila Nova de Gaia, you may admire the ?Rabelo? boats on the riverbank. They are the symbol of the famous Port Wine and the trademark of the Port Wine Cellars.
The ?Rabelo? boat, which was invented in the 9th century, was used for transporting the products from the farms of the Douro for centuries. In 1792, the ?Companhia Geral da Agricultura e Vinha do Alto Douro? published numerous charters and documents concerning this type of boat, therefore establishing the identity of the ?Rabelo?.